Battery Health Test
Check your laptop battery live: charge level, charging status and time remaining, plus how to read the real battery health report on your OS.
How to use this test
Open the page on a laptop and the live charge level, charging status and time remaining appear automatically. Then follow the OS steps on the page to read the real battery health report.
How the measurement works
The tool reads live battery level, charging state and charge/discharge time from the Battery API, and explains how to compare design capacity with full charge capacity in the OS battery report.
How to interpret results
Charge level is not health — 100% charge only means the battery is full now. Health is remaining capacity versus design capacity; below about 80% the battery is noticeably worn.
Troubleshooting tips
If the page says the Battery API is unavailable, your browser hides it (Safari and Firefox do) — use the Windows battery report, macOS System Report or Linux upower steps on the page instead.
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Common battery questions
How do I check my laptop battery health on Windows 11?
Open Command Prompt and run powercfg /batteryreport, then open the generated HTML file and compare Design Capacity with Full Charge Capacity. The battery page on this site shows the live charge level and links the same steps.
Read full answer →What is a good battery health percentage?
Above 80% of design capacity is generally fine. Between 70% and 80% you will notice shorter runtime, and below 70% a replacement is usually worth considering if you use the laptop away from a charger.
Read full answer →Why does my laptop battery drain so fast?
Common causes are a worn battery, high screen brightness, background apps and sync, a demanding browser workload, or battery saver being off. Check the OS battery report for wear first, then check which apps use the most energy.
Read full answer →Is 100% charge the same as 100% battery health?
No. Charge level only says the battery is full right now. Health compares remaining capacity with design capacity — check the OS battery report on the page for the real number.
Read full answer →